There is something unseemly about a person migrating to the U. S., doing well here, and yet being bitterly critical of her adopted country. President Trump has invited an immigrant Congresswoman who takes a very negative view of our country to go elsewhere. This has drawn claims of xenophobia and racism.
I strongly suspect most people born here, regardless of race, agree with him. Whether they'd have the courage to say so publicly is less clear.
OTOH, his willingness to proudly say what deplorables are thinking is a significant part of his popularity. And I'm certain he knows this to be true.
Deal with it, snowflakes.